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Atmospheric Environment 37 (2003) 4747–4755

Analysis of methyl tert -butyl ether in the atmosphere and implications as an exclusive indicator of automobile exhaust. Atmospheric Environment 37 (2003) 4747–4755. Speaker : Snow. MTBE. Octane-enhancing gasoline additive Enhancing the combustion efficiency

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Atmospheric Environment 37 (2003) 4747–4755

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  1. Analysis of methyl tert-butyl ether in the atmosphere and implications as an exclusive indicator of automobile exhaust Atmospheric Environment 37 (2003) 4747–4755 Speaker : Snow

  2. MTBE • Octane-enhancing gasoline additive • Enhancing the combustion efficiency • 1996, U.S Santa Monica contamination Reduce possibility of explosion Reduce CO、Hydrocarbons、O3

  3. Contamination

  4. Quick diagnosis for emission source X Y Y - X Y

  5. Field mission • Site I : Hsinchu, Guangfu Rd. • Site II : Hsinchu, Baoshan Rd. • Site III : Kaushiung city

  6. Preconcentrator (a) Trap volume 190 ml (b) 濃縮 分離 偵測

  7. Instrumental scan range 10-180 FID MS PLOT DB-1

  8. Chromatogram of C2 – C4 • GC-FID Ethtane Ethylene Propane Propene Ethyne Isobutane n-butane

  9. Chromatogram of C4 - C10 Isobutane Isopentane MTBE 2-methylpentane Benzene Toluene Ethylbenzene m,p-xylene Styrene o-xylene 1,2,4-trimethylbenzene • GC/MS

  10. GC/MS analysis Standard TIC real sample TIC real sample SIM

  11. Precision & MDL - I

  12. Precision & MDL - II

  13. Diurnal variation – site I

  14. Validation

  15. Correlations of VOCs & MTBE – site III

  16. Chemical & physical removal • Chemical removal : photochemical reaction • Physical removal : wet deposition

  17. Ratio of longer-lived VOCs to MTBE – site I

  18. Conclusion • Analytical system was established to measure VOCs and MTBEsimultaneously without interference from water. • In urban areas, MTBE was highly correlated with most VOCs. • Using VOCs/MTBEcan quickly diagnosis VOCsemissions source. • MTBE can be a useful exclusive indicator of traffic emissions.

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